byGuensburg, Thomas Edgar; Field Museum of Natural History; Sprinkle, James, 1943- joint author
Five new edrioasteroid genera from the Early and Middle Ordovician of western Utah greatly enlarge the record of this scarce echinoderm class during its early diversification. Data from a diversity of taxa were used to generate a new phylogeny and classification of the edrioasteroids. New and reinterpreted morphology, particularly for the aboral surface, is introduced. Forty-two characters were scored for 15 taxa and subjected to a PAUP 3.0 parsimony analysis. This analysis identified two major... Topics: Edrioasteroidea -- Classification, Edrioasteroidea -- Utah, Paleontology -- Ordovician,...